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</pre><pre class="rust ">
<span class="comment">// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 &lt;LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license</span>
<span class="comment">// &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>

<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fmt</span>;

<span class="kw">use</span> <span class="ident">syntax</span>;

<span class="doccomment">/// An error that occurred during parsing or compiling a regular expression.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Error</span> {
    <span class="doccomment">/// A syntax error.</span>
    <span class="ident">Syntax</span>(<span class="ident">syntax</span>::<span class="ident">Error</span>),
    <span class="doccomment">/// The compiled program exceeded the set size limit.</span>
    <span class="doccomment">/// The argument is the size limit imposed.</span>
    <span class="ident">CompiledTooBig</span>(<span class="ident">usize</span>),
    <span class="doccomment">/// **DEPRECATED:** Will be removed on next major version bump.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// This error is no longer used. (A `RegexSet` can now contain zero or</span>
    <span class="doccomment">/// more regular expressions.)</span>
    <span class="ident">InvalidSet</span>,
    <span class="doccomment">/// Hints that destructuring should not be exhaustive.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// This enum may grow additional variants, so this makes sure clients</span>
    <span class="doccomment">/// don&#39;t count on exhaustive matching. (Otherwise, adding a new variant</span>
    <span class="doccomment">/// could break existing code.)</span>
    <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
    <span class="ident">__Nonexhaustive</span>,
}

<span class="kw">impl</span> ::<span class="ident">std</span>::<span class="ident">error</span>::<span class="ident">Error</span> <span class="kw">for</span> <span class="ident">Error</span> {
    <span class="kw">fn</span> <span class="ident">description</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="ident">str</span> {
        <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
            <span class="ident">Error</span>::<span class="ident">Syntax</span>(<span class="kw-2">ref</span> <span class="ident">err</span>) <span class="op">=&gt;</span> <span class="ident">err</span>.<span class="ident">description</span>(),
            <span class="ident">Error</span>::<span class="ident">CompiledTooBig</span>(_) <span class="op">=&gt;</span> <span class="string">&quot;compiled program too big&quot;</span>,
            <span class="ident">Error</span>::<span class="ident">InvalidSet</span> <span class="op">=&gt;</span> {
                <span class="string">&quot;sets must contain 2 or more regular expressions&quot;</span>
            }
            <span class="ident">Error</span>::<span class="ident">__Nonexhaustive</span> <span class="op">=&gt;</span> <span class="macro">unreachable</span><span class="macro">!</span>(),
        }
    }

    <span class="kw">fn</span> <span class="ident">cause</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span>::<span class="ident">std</span>::<span class="ident">error</span>::<span class="ident">Error</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
            <span class="ident">Error</span>::<span class="ident">Syntax</span>(<span class="kw-2">ref</span> <span class="ident">err</span>) <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">err</span>),
            _ <span class="op">=&gt;</span> <span class="prelude-val">None</span>,
        }
    }
}

<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">Error</span> {
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
        <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
            <span class="ident">Error</span>::<span class="ident">Syntax</span>(<span class="kw-2">ref</span> <span class="ident">err</span>) <span class="op">=&gt;</span> <span class="ident">err</span>.<span class="ident">fmt</span>(<span class="ident">f</span>),
            <span class="ident">Error</span>::<span class="ident">CompiledTooBig</span>(<span class="ident">limit</span>) <span class="op">=&gt;</span> {
                <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">&quot;Compiled regex exceeds size limit of {} bytes.&quot;</span>,
                       <span class="ident">limit</span>)
            }
            <span class="ident">Error</span>::<span class="ident">InvalidSet</span> <span class="op">=&gt;</span> {
                <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">&quot;Sets must contain 2 or more regular expressions.&quot;</span>)
            }
            <span class="ident">Error</span>::<span class="ident">__Nonexhaustive</span> <span class="op">=&gt;</span> <span class="macro">unreachable</span><span class="macro">!</span>(),
        }
    }
}

<span class="kw">impl</span> <span class="ident">From</span><span class="op">&lt;</span><span class="ident">syntax</span>::<span class="ident">Error</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Error</span> {
    <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">err</span>: <span class="ident">syntax</span>::<span class="ident">Error</span>) <span class="op">-&gt;</span> <span class="ident">Error</span> {
        <span class="ident">Error</span>::<span class="ident">Syntax</span>(<span class="ident">err</span>)
    }
}
</pre>
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